Pulverized-coal-feeding device



April 9, 1929. JACKSON 1,708,505

PULVERIZED COAL FEEDING DEVICE Filed Sept. 1925 2 Sheets-Sheet 1 Wawoemiioz v 33313 flbtm; I, 9 Z Z April 9, 1929.

G. P. JACKSON 1,708,505 PULVERIZED COAL FEEDING DEVICE Filed Sept. 5,1925 2 Sheets-Sheet 2 (Inventor I 854, Qbtomuf Mf/ Patented Apr. 9,1929."

UNITED STATES PATENT OFFICE.

GEORGE P. JACKSON, OF FLUSHING, NEW YORK, ASSIGNOR TO INTERNATIONAL COM-BUSTION-ENGINEERING CORPORATION, OF NEW YORK, N. Y., A CORPORATION OFDELAWARE.

IPULVERIZED-OOAL-FEEDING DEVICE.

Application filed September 3, 1925. Serial No. 54,176.

This invention relates to devices for feeding pulverized coal and 1sespecially useful in connection with the feeding of coal to the furnace.Ordinarily all of these feeders are driven from a single shaft, suitableclutch mechanism being provided for each feeder. The feeders are cut inor cut out as'may be I needed to suit the requirements of firing.

v I propose to split the feeders into units, each unit being driven by amotor which gives me a range of flexibility not otherwise securablealthough, of course, more motors are required. However, the advantage ofincreased flexibility more than compensates for the initial increase ininvestment for the following reasons. Certain of the feeders areoperated more than the others and consequently these feeders wear morerapidly, in addition to which the wear, as between individual feeders,may vary. Since uniformity of feed is highly desirable in pulverizedfuel burning installations, I am enabled by dividing up the feeders intounits to meet these practical conditions which arise in'service andsecure-a uniformity of feed.

I further propose;- torso arrange the connections from the feeders tothe burners that I am enabled toobtain balanced flame conditions atvarious rates of operation and also at timeswhen it may benecessary toshut down one or more of the motors for repairs.

How the foregoing, together with such other objects and advantages asmay be incident to my invention, are realized, is illustrated inpreferred form in the accompany ing drawings, in which Fig. lis a sideelevation of my improved arrangement of feeding devices;

Fig; 2 is a similar view of a modification of my'invention, and

Fig. 8 is a sectional view illustratingcertain details'of the invention.

Referring now. to Fig. 1, the reference character 7 indicates the bin orbins beneath wlnch are two feeding units A and B, these units comprisinga suitable casing 8, each 035111 belng provided with the feed screws 9,eac 1 of which is adapted to discharge into a pipe 10. In the presentinstance, each unit has four feed screws and each pipe 10 leads to aburner. Each unit is. driven by a motor 11, the screws 9 being providedwith worm wheels 12 adapted to engage worms 13 on the shafts 14:. Theshafts 14 may be coupled together by a clutch 15, whereby one motor maybe utilized to drive both units.

The pipes 10 cross one another in the manner indicated in the figure sothat each unit is adapted to feed every other burner of the row ofburners C.

Normally each unit would be driven by its own motor and at low rates offiring one of the units would be cut out so that only half of theburners would be in operation. Inasmuch as when one of the units is cutout every alternate burner is cut out, it will beseen that a balancedflame condition must obtain in the furnace D. Thus at low ratings thebalanced flame condition is obtained and a similar condition is obtainedwhen it is necessary to shut down one of the units in order to makerepairs in the feeder or feeders. If one of the motors should becomedefective, it can be repaired without disturbing the normal operation bysimply coupling the two shafts 14 together.

Each feeder screw is controlled by a clutch 16 having an actuating lever16 so that indi-' screws and each unit being driven by a motor 17, eachfeeder screw being controlled by a clutch 16 as above. The pipes 18leading from each feeder screw cross in the manner indicated. By cuttingout the two middle units four burners only will be in operation andthese will be in the middle, and a balanced flame condition will result.Furthe furnace, at as high a rate as the remaining burners, in order toprevent scouring of the side walls. The independent control which isafforded by splitting up thefeeders into a large number of units'makesit possible to take care of thiscondition by slowing down the motors forthe feeders supplyingthe end burners, relative to the other motors. Asbefore, a widelrange-of flexibility, in so far as variations in the rateof firin are concerned, is obtained'by virtue of the act that a feederof each unitmay be cut in or cut out as may be required for theparticular rate at which the .installation is being fed.

What I claim is: 9

1. In combination, a source of pulverized fuel supply, a plurality offeeders arranged in groups, means for independently operating thefeeders of each group, a row of burners, pipes from feeders of a groupto nonadjacent burners in the row, and pipes from the other feeders tothe remaining burners.

2. In combination, a source of pulverized fuel supply, a plurality offeeders arranged in groups, means for independently operating thefeeders of each group, a row of burners, pipes from feeders of a groupto nonadjacent burners in the row, and pipes from the other feeders tothe remaining burners,

together with a clutch for each feeder.

3; In combination, a source of pulverized fuelsupply, a plurality offeeders arranged in groups, means for lndependently operating thefeeders of each group, a row of burners, pipes from feeders of a grou tonon adjacent burners in the row, and pipes from the other feeders to theremaining burners, together with a clutch for each feeder, and

means whereby all feeders may be driven from the same source.

4. In combination, a source of powdered fuel supply, a plurality offeeders arranged in groups and taking fuel from said source, independentmeans for operating the feeders of each group, a row of burners, andconnecting means between each feederv and a burner, one or more burnersfed by a feeder of one particular group being positioned between burnersfed by. feeders not of that group.

5. In combination, a source of powdered fuel supply, a plurality offeeders arranged in groups and taking fuel from said source, independentmeans for'operating the feed ers of each group, arow of burners, andconnecting means between each feeder and a burner, one or more burnersfed by a feeder of one particular group being positioned hetween'burnersfed'by feeders not of that group, together with means for causing theoperating means of one group to operate more than one group. Y

6. Inc'ombination, a source of powdered fuelsupply, a plurality offeeders arranged in groups and taking fuel from said source, independentmeans for operating the feeders of each group, a row of burners, andconnecting means between each feeder and a burner, one or more burnersfed by a feeder of one particular group being positioned between burnersfed' by' feeders not of that group, together with means for renderingindividual feeders inoperative.

7. In combination, a source of powdered fuel supply, a plurality offeeders arranged in groups'and taking fuel from said'source, independentmeans for operating the feeders of each group, a row of burners, andconnecting means between each feeder and a burner, one or more burnersfed by a feeder of one particular group being positioned between burnersfed by feeders not of that group, together with means for causing theoperating means of one group to operate more than one group and meansfor rendering individual feeders inoperative.

' In testimony whereof, I have hereunto signed my name.

GEORGE P. JACKSON.

